diff --git a/Dockerfile--alpine.tmpl b/Dockerfile--alpine.tmpl
index 1cc1f6a2..b99f12cd 100644
--- a/Dockerfile--alpine.tmpl
+++ b/Dockerfile--alpine.tmpl
@@ -103,7 +103,16 @@ ENV LANG=C.UTF-8
 
 RUN chmod 700 /home/test/ && \
     mkdir -p /home/test/.ssh && \
+    echo 'Host *' > /home/test/.ssh/config && \
+    echo '    ControlMaster auto' >> /home/test/.ssh/config && \
+    echo '    ControlPath /home/test/.ssh/master-%r@%h:%p' >> /home/test/.ssh/config && \
+    echo '    ControlPersist 30m' >> /home/test/.ssh/config && \
+    echo '    StrictHostKeyChecking no' >> /home/test/.ssh/config && \
+    echo '    UserKnownHostsFile /dev/null' >> /home/test/.ssh/config && \
+    # echo '    GSSAPIAuthentication no' >> /home/test/.ssh/config && \
     chown -R test:test /home/test/.ssh && \
+    chmod 700 /home/test/.ssh && \
+    chmod 600 /home/test/.ssh/config && \
     mkdir /home/test/testgres/logs && \
     chown -R test:test /home/test/testgres/logs
 
@@ -131,11 +140,6 @@ if [ ! -f /home/test/.ssh/id_rsa ]; then \
     chmod 600 /home/test/.ssh/authorized_keys; \
 fi; \
 ls -la /home/test/.ssh/; \
-su test -c \"ssh-keyscan -H localhost >> /home/test/.ssh/known_hosts\"; \
-su test -c \"ssh-keyscan -H 127.0.0.1 >> /home/test/.ssh/known_hosts\"; \
-if [ -n \"${TEST_CFG__REMOTE_HOST:-}\" ]; then \
-    su test -c \"ssh-keyscan -H ${TEST_CFG__REMOTE_HOST} >> /home/test/.ssh/known_hosts\"; \
-fi; \
 if [ -n \"${TEST_CFG__REMOTE_SSH_KEY:-}\" ]; then \
     cp \"${TEST_CFG__REMOTE_SSH_KEY}\" \"${TEST_CFG__REMOTE_SSH_KEY}_ci\"; \
     export TEST_CFG__REMOTE_SSH_KEY=\"${TEST_CFG__REMOTE_SSH_KEY}_ci\"; \
diff --git a/Dockerfile--altlinux_10.tmpl b/Dockerfile--altlinux_10.tmpl
index 036328f2..5a04aba8 100644
--- a/Dockerfile--altlinux_10.tmpl
+++ b/Dockerfile--altlinux_10.tmpl
@@ -94,7 +94,16 @@ ENV LANG=C.UTF-8
 
 RUN chmod 700 /home/test/ && \
     mkdir -p /home/test/.ssh && \
-    chown -R test:test /home/test/.ssh
+    echo 'Host *' > /home/test/.ssh/config && \
+    echo '    ControlMaster auto' >> /home/test/.ssh/config && \
+    echo '    ControlPath /home/test/.ssh/master-%r@%h:%p' >> /home/test/.ssh/config && \
+    echo '    ControlPersist 30m' >> /home/test/.ssh/config && \
+    echo '    StrictHostKeyChecking no' >> /home/test/.ssh/config && \
+    echo '    UserKnownHostsFile /dev/null' >> /home/test/.ssh/config && \
+    echo '    GSSAPIAuthentication no' >> /home/test/.ssh/config && \
+    chown -R test:test /home/test/.ssh && \
+    chmod 700 /home/test/.ssh && \
+    chmod 600 /home/test/.ssh/config
 
 #
 # \"$@\"
@@ -104,7 +113,7 @@ RUN chmod 700 /home/test/ && \
 ENTRYPOINT ["sh", "-c", " \
     set -eux; \
     echo 'SYSTEM START: PREPARING SSH'; \
-    /usr/sbin/sshd; \
+    (ulimit -n 1024 && /usr/sbin/sshd); \
     ls -la /home/test/.ssh/; \
     \"$@\" \
 ", "DUMMY-DUMMY-DUMMY"]
diff --git a/Dockerfile--altlinux_11.tmpl b/Dockerfile--altlinux_11.tmpl
index 8b29c077..c46f78bb 100644
--- a/Dockerfile--altlinux_11.tmpl
+++ b/Dockerfile--altlinux_11.tmpl
@@ -95,7 +95,16 @@ ENV LANG=C.UTF-8
 
 RUN chmod 700 /home/test/ && \
     mkdir -p /home/test/.ssh && \
-    chown -R test:test /home/test/.ssh
+    echo 'Host *' > /home/test/.ssh/config && \
+    echo '    ControlMaster auto' >> /home/test/.ssh/config && \
+    echo '    ControlPath /home/test/.ssh/master-%r@%h:%p' >> /home/test/.ssh/config && \
+    echo '    ControlPersist 30m' >> /home/test/.ssh/config && \
+    echo '    StrictHostKeyChecking no' >> /home/test/.ssh/config && \
+    echo '    UserKnownHostsFile /dev/null' >> /home/test/.ssh/config && \
+    echo '    GSSAPIAuthentication no' >> /home/test/.ssh/config && \
+    chown -R test:test /home/test/.ssh && \
+    chmod 700 /home/test/.ssh && \
+    chmod 600 /home/test/.ssh/config
 
 #
 # \"$@\"
@@ -105,7 +114,7 @@ RUN chmod 700 /home/test/ && \
 ENTRYPOINT ["sh", "-c", " \
     set -eux; \
     echo 'SYSTEM START: PREPARING SSH'; \
-    /usr/sbin/sshd; \
+    (ulimit -n 1024 && /usr/sbin/sshd); \
     ls -la /home/test/.ssh/; \
     \"$@\" \
 ", "DUMMY-DUMMY-DUMMY"]
diff --git a/Dockerfile--ubuntu_24_04.tmpl b/Dockerfile--ubuntu_24_04.tmpl
index eda0856c..340999f1 100644
--- a/Dockerfile--ubuntu_24_04.tmpl
+++ b/Dockerfile--ubuntu_24_04.tmpl
@@ -64,7 +64,16 @@ ENV LANG=C.UTF-8
 
 RUN chmod 700 /home/test/ && \
     mkdir -p /home/test/.ssh && \
-    chown -R test:test /home/test/.ssh
+    echo 'Host *' > /home/test/.ssh/config && \
+    echo '    ControlMaster auto' >> /home/test/.ssh/config && \
+    echo '    ControlPath /home/test/.ssh/master-%r@%h:%p' >> /home/test/.ssh/config && \
+    echo '    ControlPersist 30m' >> /home/test/.ssh/config && \
+    echo '    StrictHostKeyChecking no' >> /home/test/.ssh/config && \
+    echo '    UserKnownHostsFile /dev/null' >> /home/test/.ssh/config && \
+    echo '    GSSAPIAuthentication no' >> /home/test/.ssh/config && \
+    chown -R test:test /home/test/.ssh && \
+    chmod 700 /home/test/.ssh && \
+    chmod 600 /home/test/.ssh/config
 
 #
 # \"$@\"
@@ -90,11 +99,6 @@ if [ ! -f /home/test/.ssh/id_rsa ]; then \
     chmod 600 /home/test/.ssh/authorized_keys; \
 fi; \
 ls -la /home/test/.ssh/; \
-su test -c \"ssh-keyscan -H localhost >> /home/test/.ssh/known_hosts\"; \
-su test -c \"ssh-keyscan -H 127.0.0.1 >> /home/test/.ssh/known_hosts\"; \
-if [ -n \"${TEST_CFG__REMOTE_HOST:-}\" ]; then \
-    su test -c \"ssh-keyscan -H ${TEST_CFG__REMOTE_HOST} >> /home/test/.ssh/known_hosts\"; \
-fi; \
 if [ -n \"${TEST_CFG__REMOTE_SSH_KEY:-}\" ]; then \
     cp \"${TEST_CFG__REMOTE_SSH_KEY}\" \"${TEST_CFG__REMOTE_SSH_KEY}_ci\"; \
     export TEST_CFG__REMOTE_SSH_KEY=\"${TEST_CFG__REMOTE_SSH_KEY}_ci\"; \